Panasonic V-Log L Function Activation Code for Lumix DMC-GH4, DC-GH5, DMC-FZ2500K &quot;LUMIX DMC-GH4&quot; dedicated &quot;V-Log L upgrade software key&quot; Photographs in wide tone - Color grading can also be used for possible LOG shooting function in GH4 in post-production To get this function in GH4, you must upgrade to the firmware Ver.2.3